2025 Grech Strada Ion AWD always stored indoors. Just had it serviced at the Mercedes Benz dealership. Recently had it ceramic coated. While in storage it has the chassis battery on maintainer charger. I also have a MouseBlocker 360x running in the storage bay.
The microwave, refrigerator, cooktop, and toilet have never been used.
Wife developed some health issues shortly after purchasing, so we didn't get to use it.